Hi guys. New on here.Get a bit of condensation on windows in bedrooms overnight. Looking at options for ventilation and opinions.As the bedrooms are at the front I would prefer to avoid vents going through the cavity wall.

I was thinking about ceiling vent and a length of 4 inch wavin pipe ( plastic sewer pipe) with few T pieces to each bedroom to a vent on the gable end, so all rooms go to 1 vent, may put a small inline ventilation fan with a timer for air Changes over night... wont be a sophisticated balanced system, but wont be too expensive...Opinions, thoughts and donations accepted.

Insufficient air flow is the cause. The best solution is to fit vents into the window frames. These cost about £12-15 from any UPVC supplier. Use a small drill bit to ensure that you are clear of any internal metal strengthening. This should reduce moisture being trapped internally and precipitating on the colder surfaces promoting mould growth.

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